Amazon Linux AMI update for sudo

1) Out-of-bounds write

EUVDB-ID: #VU68973

Risk: Low

CVSSv3.1: 3.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-43995

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary condition within plugins/sudoers/auth/passwd.c when Sudo is configured to use the crypt() password backend (e.g. when passwd authentication is enabled). A local user with access to Sudo  can enter a password of 8 characters or fewer to trigger a heap-based buffer over-read and gain access to sensitive information.

Mitigation

Update the affected packages:

aarch64:
    sudo-logsrvd-debuginfo-1.9.12-1.p2.amzn2023.0.2.aarch64
    sudo-devel-1.9.12-1.p2.amzn2023.0.2.aarch64
    sudo-python-plugin-debuginfo-1.9.12-1.p2.amzn2023.0.2.aarch64
    sudo-debuginfo-1.9.12-1.p2.amzn2023.0.2.aarch64
    sudo-python-plugin-1.9.12-1.p2.amzn2023.0.2.aarch64
    sudo-logsrvd-1.9.12-1.p2.amzn2023.0.2.aarch64
    sudo-1.9.12-1.p2.amzn2023.0.2.aarch64
    sudo-debugsource-1.9.12-1.p2.amzn2023.0.2.aarch64

src:
    sudo-1.9.12-1.p2.amzn2023.0.2.src

x86_64:
    sudo-python-plugin-debuginfo-1.9.12-1.p2.amzn2023.0.2.x86_64
    sudo-logsrvd-debuginfo-1.9.12-1.p2.amzn2023.0.2.x86_64
    sudo-debuginfo-1.9.12-1.p2.amzn2023.0.2.x86_64
    sudo-python-plugin-1.9.12-1.p2.amzn2023.0.2.x86_64
    sudo-devel-1.9.12-1.p2.amzn2023.0.2.x86_64
    sudo-logsrvd-1.9.12-1.p2.amzn2023.0.2.x86_64
    sudo-debugsource-1.9.12-1.p2.amzn2023.0.2.x86_64
    sudo-1.9.12-1.p2.amzn2023.0.2.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

sudo: before 1.8.23-10.59

CPE2.3

• cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:
• cpe:2.3:o:amazon_web_services:sudo:*:*:*:*:*:amazon_linux_ami:*:

External links

http://alas.aws.amazon.com/AL2023/ALAS-2023-106.html

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Input validation error

EUVDB-ID: #VU71332

Risk: Low

CVSSv3.1: 7.2 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C]

CVE-ID: CVE-2023-22809

CWE-ID: CWE-20 - Improper input validation

Exploit availability: Yes

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists within the sudoedit (aka -e) feature due to insufficient validation of user-supplied input passed in the user-provided environment variables (SUDO_EDITOR, VISUAL, and EDITOR). The problem exists because a user-specified editor may contain a "--" argument that defeats a protection mechanism, e.g., an EDITOR='vim -- /path/to/extra/file' value. A local user can append arbitrary entries to the list of files to process and escalate privileges on the system.

Mitigation

Update the affected packages:

aarch64:
    sudo-logsrvd-debuginfo-1.9.12-1.p2.amzn2023.0.2.aarch64
    sudo-devel-1.9.12-1.p2.amzn2023.0.2.aarch64
    sudo-python-plugin-debuginfo-1.9.12-1.p2.amzn2023.0.2.aarch64
    sudo-debuginfo-1.9.12-1.p2.amzn2023.0.2.aarch64
    sudo-python-plugin-1.9.12-1.p2.amzn2023.0.2.aarch64
    sudo-logsrvd-1.9.12-1.p2.amzn2023.0.2.aarch64
    sudo-1.9.12-1.p2.amzn2023.0.2.aarch64
    sudo-debugsource-1.9.12-1.p2.amzn2023.0.2.aarch64

src:
    sudo-1.9.12-1.p2.amzn2023.0.2.src

x86_64:
    sudo-python-plugin-debuginfo-1.9.12-1.p2.amzn2023.0.2.x86_64
    sudo-logsrvd-debuginfo-1.9.12-1.p2.amzn2023.0.2.x86_64
    sudo-debuginfo-1.9.12-1.p2.amzn2023.0.2.x86_64
    sudo-python-plugin-1.9.12-1.p2.amzn2023.0.2.x86_64
    sudo-devel-1.9.12-1.p2.amzn2023.0.2.x86_64
    sudo-logsrvd-1.9.12-1.p2.amzn2023.0.2.x86_64
    sudo-debugsource-1.9.12-1.p2.amzn2023.0.2.x86_64
    sudo-1.9.12-1.p2.amzn2023.0.2.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

sudo: before 1.8.23-10.59

CPE2.3

• cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:
• cpe:2.3:o:amazon_web_services:sudo:*:*:*:*:*:amazon_linux_ami:*:

External links

http://alas.aws.amazon.com/AL2023/ALAS-2023-106.html

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.